[China Aluminum Industry Net] Research and Development of Nano Aluminum in Rocket Propellant Applications Aluminum content Metallic elements occupy second place in the earth's crust, second only to iron content. In daily life, various aluminum products have been widely used by people. What is more noteworthy is that due to the high density of aluminum, low oxygen consumption, and high combustion enthalpy, it is possible to have higher aluminum powder content in solid propellants, which is quite significant for improving specific impulse. In addition to the abundant raw materials and low cost, additives as energy materials are widely used in rocket propellants.
Compared with common aluminum powder, nano-aluminum powder has the characteristics of faster burning and greater heat release. If the solid fuel propellant is added with 1% mass ratio of ultrafine aluminum or nickel particles, the heat of combustion of the fuel can be increased by 1 times. ̈]. According to reports from abroad, in the HTPB composite propellant, 20% of Alex (ARGONIDE's nano-aluminum powder) is added, and the burning rate can be increased by 70% compared with the same amount of ordinary aluminum powder.
Research and development of application of nano-aluminum in explosives The addition of high-calorific-value metal powders to explosives is one of the ways to increase the explosive's ability to function. Aluminum-containing explosives as a type of high-density, high-explosive, high-power explosives have been widely used in underwater weapons and air defense weapons. Nano aluminum and other metal oxide nano-materials self-assembled after the combustion rate can reach 1500-2300m / s, the shock wave can reach 3 Mach. This nanosized "smart bomb" is expected to deliver targeted drugs to cancer cells without damaging healthy cells. This high-energy explosive, which is successfully blended with nano-aluminum powder and metal oxides, has a surface area that is much greater than that of conventional hot-heat powders, and thus it can provide a combustion rate equivalent to ten times that of existing propellant propellants.
Nano-aluminum in the application of solar cells Research and progress With the continuous improvement of the solar cell materials and production levels, solar cell lifetime of the minority son is also increasing, that is, the diffusion length of the child is increasing, when the minority carrier When the diffusion length is equal to or exceeds the thickness of the silicon wafer, the effect of the recombination speed of the back surface on the characteristics of the solar cell is obvious. From today's commercial solar cells, in order to reduce the cost of solar cells and increase efficiency, manufacturers are constantly reducing the thickness of silicon wafers to reduce the price of raw materials. Therefore, in order to improve the efficiency of the battery, it is necessary to consider reducing the recombination speed of the back surface of the battery and improving the long-wavelength spectral response. Therefore, the quality of aluminum back field will directly affect the output characteristics of solar cells '7J. The particles are small, the aluminum paste is in good contact with the silicon wafer, and the particles are large. Some areas have large gaps with the silicon surface. There are voids, and the aluminum paste is in poor contact with the silicon wafer. This results in the aluminum back being not formed in some areas. field. Therefore, the particle size of the aluminum paste has a very important relationship with the formation and quality of the aluminum back field.
The smaller the aluminum particles, the lower the melting point, the easier to form a silicon-aluminum composite layer at a certain temperature and silicon-based materials, which is more conducive to the formation of aluminum back-field and improve the output characteristics of solar cells.
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